Below is an explanation of the choosen model for polymath.
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See also <a href="http://en.wikipedia.org/wiki/Species">http://en.wikipedia.org/wiki/Species</a>

<p>
   Carl von Linne, a Swedish botanist (plant scientist) known as Carolus Linnaeus (Latin was the common
   language for European science, so writings and often names were Latinized), began work in 1735 on a
   system that would organize descriptive classification from the smallest of related groups up to the
   very largest. The system he developed, with revisions, is the basic system still used today to
   systematically organize types of living things with their relatives. The basic structure was similar
   to how human organizations of the time worked, with groups-contained-within-groups, be they feudal
   power structures or military structures. Each particular type of living thing would be designated
   a <a href="http://en.wikipedia.org/wiki/Species">species</a> (from the same root word as "specific"). Closely-related species could be collected
   within a larger grouping, a <a href="http://en.wikipedia.org/wiki/Genus">genus</a>; related genera are grouped into a <a href="http://en.wikipedia.org/wiki/Family_(biology)">family</a>, families into an <a href="http://en.wikipedia.org/wiki/Order_(biology)">order</a>,
   orders into a <a href="http://en.wikipedia.org/wiki/Class_(biology)">class</a>, classes into a <a href="http://en.wikipedia.org/wiki/Phylum">phylum</a>, and phyla into a <a href="http://en.wikipedia.org/wiki/Kingdom_(biology)">Kingdom</a>, the biggest and most general group.
   In Linnaeus' time, there were just the Animal Kingdom and the Plant Kingdom, but later discoveries
   convinced biologists that some distinctly different types of organisms, such as Fungi and some tiny
   single-celled organisms, should be given their own separate Kingdoms.
</p>
<p>
   Later there was introduced even higher taxonomic ranks <a href="http://en.wikipedia.org/wiki/Domain_(biology)">Domain</a>
   and all of it can be grouped into <a href="http://en.wikipedia.org/wiki/Life">Life</a>.

</p>
<p>
   Some subdisciplines of biology use a basic Linnaean type of taxonomy, but may change the basic names used for a few
   of the groups. Commonly, for instance, plant and fungus taxonomy uses the term Division instead of Phylum.
</p>
